webui: add persistent GPU settings management (ECC/MIG/CC/power limit)
Adds a GPU Settings card to /tools for the settings that actually persist on NVIDIA data-center GPUs: ECC mode, MIG mode, and Confidential Computing mode (all stored in the GPU's inforom/firmware, take effect after a GPU reset or reboot) plus power limit (does not persist — reapplied on demand). Includes a one-click "Reset All to Defaults" that restores factory settings across every visible GPU, touching only whatever has actually drifted. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Mikhail Chusavitin
co-authored by
Claude Sonnet 5
Claude Sonnet 5
parent
2599d9c5e3
commit
53c46465d2
@@ -0,0 +1,183 @@
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package platform
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import (
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"fmt"
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"strconv"
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"strings"
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)
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// NvidiaGPUSetting reports the persistent GPU settings that nvidia-smi
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// exposes: ECC mode, MIG mode, and Confidential Computing mode all persist
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// via the GPU's inforom/firmware and survive a reboot, but only take effect
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// after a GPU reset (nvidia-smi -r) or host reboot (hence separate
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// current/pending fields for ECC and MIG). Power limit does NOT persist
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// across reboot/driver reload — it is re-applied here on demand, same as
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// nvidia-smi's own behavior.
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type NvidiaGPUSetting struct {
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Index int `json:"index"`
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Name string `json:"name"`
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ECCCurrent string `json:"ecc_current"` // "Enabled" / "Disabled" / "N/A"
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ECCPending string `json:"ecc_pending"` // differs from current until a GPU reset/reboot
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MIGCurrent string `json:"mig_current"` // "Enabled" / "Disabled" / "N/A" (N/A = not MIG-capable)
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MIGPending string `json:"mig_pending"`
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CCState string `json:"cc_state"` // "ON" / "OFF" / "" (unsupported or query failed)
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PowerLimitW float64 `json:"power_limit_w"`
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PowerMinLimitW float64 `json:"power_min_limit_w"`
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PowerMaxLimitW float64 `json:"power_max_limit_w"`
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PowerDefaultLimitW float64 `json:"power_default_limit_w"`
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}
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// ListNvidiaGPUSettings reports current ECC, MIG, Confidential Computing and
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// power-limit configuration per GPU.
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func (s *System) ListNvidiaGPUSettings() ([]NvidiaGPUSetting, error) {
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out, err := satExecCommand("nvidia-smi",
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"--query-gpu=index,name,ecc.mode.current,ecc.mode.pending,mig.mode.current,mig.mode.pending,power.limit,power.min_limit,power.max_limit,power.default_limit",
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"--format=csv,noheader,nounits").Output()
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if err != nil {
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return nil, fmt.Errorf("nvidia-smi: %w", err)
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}
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var settings []NvidiaGPUSetting
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for _, line := range strings.Split(strings.TrimSpace(string(out)), "\n") {
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line = strings.TrimSpace(line)
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if line == "" {
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continue
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}
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parts := strings.Split(line, ",")
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if len(parts) < 10 {
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continue
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}
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idx, err := strconv.Atoi(strings.TrimSpace(parts[0]))
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if err != nil {
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continue
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}
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g := NvidiaGPUSetting{
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Index: idx,
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Name: strings.TrimSpace(parts[1]),
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ECCCurrent: strings.TrimSpace(parts[2]),
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ECCPending: strings.TrimSpace(parts[3]),
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MIGCurrent: strings.TrimSpace(parts[4]),
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MIGPending: strings.TrimSpace(parts[5]),
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PowerLimitW: parseNvidiaFloat(parts[6]),
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PowerMinLimitW: parseNvidiaFloat(parts[7]),
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PowerMaxLimitW: parseNvidiaFloat(parts[8]),
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PowerDefaultLimitW: parseNvidiaFloat(parts[9]),
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}
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g.CCState = s.queryNvidiaGPUCCState(idx)
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settings = append(settings, g)
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}
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return settings, nil
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}
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// queryNvidiaGPUCCState reads the per-GPU Confidential Computing state via
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// `nvidia-smi conf-compute -i <index> -q`, reusing the same field-name
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// convention as RunConfidentialComputingCheckPack's parseConfComputeFields.
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// Returns "" if the driver/GPU doesn't support conf-compute at all.
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func (s *System) queryNvidiaGPUCCState(index int) string {
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out, err := satExecCommand("nvidia-smi", "conf-compute", "-i", strconv.Itoa(index), "-q").Output()
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if err != nil {
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return ""
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}
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return parseConfComputeFields(out)["CC State"]
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}
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func parseNvidiaFloat(v string) float64 {
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f, err := strconv.ParseFloat(strings.TrimSpace(v), 64)
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if err != nil {
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return 0
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}
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return f
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}
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// SetNvidiaGPUECC sets pending ECC mode for one GPU. Takes effect after the
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// GPU is reset (nvidia-smi -r) or the host is rebooted.
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func (s *System) SetNvidiaGPUECC(index int, enabled bool) (string, error) {
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val := "0"
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if enabled {
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val = "1"
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}
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out, err := satExecCommand("nvidia-smi", "-i", strconv.Itoa(index), "-e", val).CombinedOutput()
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return string(out), err
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}
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// SetNvidiaGPUMIG sets pending MIG (Multi-Instance GPU) mode for one GPU.
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// Persists via inforom but takes effect only after a GPU reset (nvidia-smi
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// -r) or host reboot. Only supported on MIG-capable GPUs (Ampere/Hopper
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// data-center parts); fails harmlessly on others.
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func (s *System) SetNvidiaGPUMIG(index int, enabled bool) (string, error) {
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val := "0"
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if enabled {
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val = "1"
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}
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out, err := satExecCommand("nvidia-smi", "-i", strconv.Itoa(index), "-mig", val).CombinedOutput()
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return string(out), err
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}
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// SetNvidiaGPUCCMode sets Confidential Computing mode for one GPU
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// (nvidia-smi conf-compute -scc). Persists via inforom, reversible, but
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// takes effect only after a GPU reset (nvidia-smi -r) or host reboot.
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func (s *System) SetNvidiaGPUCCMode(index int, enabled bool) (string, error) {
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val := "0"
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if enabled {
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val = "1"
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}
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out, err := satExecCommand("nvidia-smi", "conf-compute", "-i", strconv.Itoa(index), "-scc", val).CombinedOutput()
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return string(out), err
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}
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// SetNvidiaGPUPowerLimit sets the power limit (watts) for one GPU. Does not
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// persist across reboot/driver reload — callers that want a durable change
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// must re-apply it (e.g. at boot), same as nvidia-smi's own semantics.
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func (s *System) SetNvidiaGPUPowerLimit(index int, watts float64) (string, error) {
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out, err := satExecCommand("nvidia-smi", "-i", strconv.Itoa(index), "-pl", strconv.FormatFloat(watts, 'f', 0, 64)).CombinedOutput()
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return string(out), err
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}
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// ResetNvidiaGPUDefaults restores factory-default settings on every visible
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// NVIDIA GPU that has drifted from them: power limit back to
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// power.default_limit (as reported by nvidia-smi), ECC re-enabled (NVIDIA
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// data-center GPUs ship with ECC on; nvidia-smi has no queryable "ECC
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// default" field, so this is the documented factory default, not a value
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// read back from hardware), and MIG/Confidential-Computing mode disabled
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// (both ship off from the factory). GPUs already at defaults are left
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// alone.
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func (s *System) ResetNvidiaGPUDefaults() (string, error) {
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settings, err := s.ListNvidiaGPUSettings()
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if err != nil {
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return "", err
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}
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var out strings.Builder
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for _, g := range settings {
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if g.PowerDefaultLimitW > 0 && g.PowerLimitW != g.PowerDefaultLimitW {
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res, err := s.SetNvidiaGPUPowerLimit(g.Index, g.PowerDefaultLimitW)
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out.WriteString(res)
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if err != nil {
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fmt.Fprintf(&out, "GPU %d: power limit reset failed: %v\n", g.Index, err)
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}
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}
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if strings.EqualFold(g.ECCCurrent, "disabled") {
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res, err := s.SetNvidiaGPUECC(g.Index, true)
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out.WriteString(res)
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if err != nil {
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fmt.Fprintf(&out, "GPU %d: ECC re-enable failed: %v\n", g.Index, err)
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}
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}
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if strings.EqualFold(g.MIGCurrent, "enabled") {
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res, err := s.SetNvidiaGPUMIG(g.Index, false)
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out.WriteString(res)
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if err != nil {
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fmt.Fprintf(&out, "GPU %d: MIG disable failed: %v\n", g.Index, err)
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}
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}
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if strings.EqualFold(g.CCState, "on") {
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res, err := s.SetNvidiaGPUCCMode(g.Index, false)
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out.WriteString(res)
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if err != nil {
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fmt.Fprintf(&out, "GPU %d: CC mode disable failed: %v\n", g.Index, err)
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}
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}
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}
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if out.Len() == 0 {
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out.WriteString("All GPUs already at factory-default settings.\n")
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}
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return out.String(), nil
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}
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